WSM Overbore Piston Kit .5mm Over 100.5mm for Yamaha Raptor Grizzly Rhino 660

Whether you're increasing the bore of your engine for more power or if it's just time for a rebuild and upgrade, this Overbore Piston Kit is what you want! These WSM Overbore Piston Kits are high-quality and feature construction that meets or exceeds OEM specifications. Every kit is made of high-grade materials to ensure it can withstand whatever your ride puts you through. These kits contain one piston, a ring set, a wrist pin, and improved E-clips. Whether you're looking for a more powerful ride, low-end torque, or even more top-end horsepower, these kits are what you need! These piston kits are also available in the platinum series, featuring specially hardened tops and an enhanced skirt coating for increased performance and longevity. This kit is for cylinders that have already been overbored. WILL NOT WORK WITH STOCK BORE CYLINDERS/SLEEVES.